Water-tube steam-generator.



ented May l4, l90l.

No. e74,|o2. Pat

F. H. A. VON STRALENDORFF. WATER TUBE STEAM GENERATOR.

I (Application filed Feb. 12, 1901.) (No Model.) 2 Sheets-Sheet I. 1

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No. 674,l02. Patented May l4, I901.- F. H. A. VON STRALENDURFF.

' WATER TUBE STEAM GENERATOR.

(Application filer; Feb. 12, 1901. (No Model.) 2 Sheets-Sheet 2.

UNITED STATES PATENT EEIcE.

FREDERICK HERBERT AUSTIN VON STRALENDORFF, OF CHESTER,

ENGLAND.

WATER-TU BE STEAM -e EN ERATOR.

SPECIFICATION forming part of Letters Patent No. 674,102, dated May 14, 1901. Application filed February 12, 1901. Serial No- 471032- (No model.)

To all whom, it may concern.-

Be it known that I, FREDERICK HERBERT AUSTIN VON STRALENDORFF, a subject of the King of Great Britain, residing at Chester, in the county of Chester, England, have invented certain new and useful Improvements in Water-Tube SteamGenerators, of which the following is a full, clear, and exact description.

This invention relates to that class of steamgenerators in which there is atransverse steam and water drum above the front of the furnace, a header or headers dependent therefrom and communicating therewith, a partition in each header separating its back and front parts, and a series of separate concentric evaporation and circulation tubes, of which the former connect with the furnace side of the header and the latter with its front side. In steam-generators of this type the circulating water passes downward through the front compartment of the header,outward through all the circulation -tubes, inward through all the evaporation-tubes, and upward on its return to the steam and water drum through the back compartment of the header. Steam-generators of this class have been well known for upward of twenty-five years past.

My present invention relates to the means and appliances whereby the evaporation and circulation tubes may be respectively connected to the headers, and it has been designed with the object of insuring that any of the tubes may be readily replaced and removed and so that the appliances shall act as headerstays.

I will describe my improvements with reference to the accompanying drawings, in which Figure l is a diagram representing in vertical section a steam-generator of the class described, all details being omitted. Fig. 2 is a longitudinal section taken through the center of my improved connecting appliance. Fig. 3 shows a section taken along the line a a, Fig. 2; and Fig. 4, a section taken along the line b b. Fig. 5 is a sectional view of a modified detail.

In each of the figures, where the parts are represented, A indicates the steam and water drum; B, the header; C, the front wall, and D the back wall, of the header; E, the partition in the header; G, the evaporation-tubes, and H the circulation'tubes.

The outer ends of the evaporation-tubes are closed, and both ends of the circulation-tubes are open. The water is assumed to circulate in the direction indicated by the arrows, Fig.1.

Myimproved appliance consists,essentially, of a sleeve, a liner, a plunger, ascrewed collar, and a screw-block fitting in the collar. The sleeve is fixed in coaxial holes formed through the walls and partition of the header. As shown by the drawings, Fig. 2, the sleeve I is internallyand externally coned at the furnace end, provided with lateral perforations i i, as hereinafter described, for circulation, and has at the opposite end an extension, preferably a collar J,internally screw-threaded to fit upon the screw-threaded nut of the sleeve. This collar is fitted after the sleeve has been inserted. The screwed collar is externally coned and, like the external-coned part of the sleeve, diminishes toward the partition E. Both the holes in which these parts fit in the header-walls are correspondingly coned. It follows from this construction that when the collar J is screwed inward the force exerted will tend to hold the header-walls together and that the sleeve thus becomes an effective stay. The outer periphery of the collar.] may be polygonal or otherwise formed so as to be capable of being turned by means of a spanner or other equivalent appliance. The hollow liner K, which is placed within the sleeve 1, is externally coned to correspond with the internally-coned part of the sleeve, both these coned parts increasing in diameter toward the partition E. At its opposite end the liner is headed and bored with a conical hole'diminishing toward the furnace'end.

The hollow plunger L fits in the outer part of the sleeve and is coned at its inner end to correspond with the conical hole in the liner and has at its outer end a headM, fitting the sleeve. The liner has lateral openings k k, and the plunger the similar openings Z Z, for water-circulation.

The screwed block N is inserted in the collar J and is capable of being screwed up against the head of the plunger L, and thus forcing the latter in the direction of the furnace. The block may be turned by a suitably-shaped key fitting in the recess a.

It is to be noted that the coned parts at O are more obtuse than the cones at P.

Those ends of the evaporation and circulation tubes which are to be connected are flared to correspond with the coned parts 0 and P, respectively. The sleeve I is first inserted from the back of the header, and the screwed collar J is firmly screwed upon it. The evaporation-tube is inserted from the front and pushed home until its flared part fits in the cone at P. The liner K is then pushed down upon it from the front, and the circulation-tube H is inserted through it until its flared part fits in the cone at 0. Next the plunger L is pushed in, and finally the screwed block N is inserted and screwed up tightly. The effectof this is to grip the fiared ends of the evaporation-tube firmly between the coned parts at P and the flared end of the circulation-tube between the coned parts at 0. Because of the more rapid diminution of the coned parts 0 these first come into firm grip with the circulation-tube, and the motion of the screwed block being continued this tube is carried forward with the plunger and liner until the flared end of the evaporalion-tube is'firmly gripped at P.

The inner or furnace end of the sleeve I in stead of being externally coned and of fitting into a coned hole, as shown by Fig. 2, may be externally screwed and fit into a correspondingly-screw-threaded hole in the back wall of the header, as shown by Fig. 5. In the latter case the sleeve may or may not be provided with the external back flange R, fitting upon the header-plate. The sleeve will have to be turned in fitting it into the header. This movement may be given to it by a T- shaped tool, of which the perpendicular is the handle and the cross head the key. The cross-head is pivoted and is kept in a position at right angles by springs. The cross-head is turned at an acute angle with the handle and entered into the sleeve, whereupon the cross-head enters the lateral openings and the sleeve can be turned. Such appliances are well known.

The normal course of the water in circulation is downward through the outer part of the header, throi'igh the openings 2' 7: Z Z into the circulation-tubes, backward through the evaporation-tubes and the openings 7.: 7c 7) t", and upward to the steam and water 'drum again through that compartment of the header nearer to the furnace.

It is evident that the collar J, Fig. 2, can be omitted, the extension being made by extending the front end of the sleeve, which is itself externally screwed and fitted with a nut, the screwed block N being fitted within it.

I'Iaving now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. In a water-tube steam-generator of the class described, concentric circulation and evaporation tubes flared at their contiguous front ends, a laterally-perforated tubular header-stay internally coned at the back end to receive the flared end of the evaporationtube and having an internally-screwed extension at the front end, a laterally-perforated liner with a coned end fitting the flared end of the evaporation-tube and having an axial coned hole adapted to receive the flared end of the circulation-tube,ahollow laterally-perforated and headed plunger having a coned end fil'iting the flared part of the circulationtube, and a screwed block fitting the internally-screwed extension of the stayand adapted to force the plunger in the direction of the tube, substantially as set forth.

2. In a water-tube steam-generator of the class describecha laterally-perforated tubular header-stay internally coned at the back end and having an internally-screwed extension at the front end, in combination with a laterally-perforated liner coned to correspond with the coned back end of the tubular stay and having a head with an xial coned hole through it, a headed and lateral]y-perforated hollow plunger coned to fit in the head of the liner, and a screwblock fitting into the screwed extension of the stay, substantially as set forth.

In a water-tube steam-generator of the class describechalaterally-perforated tubular header-stay internally and externally coned at the back end having at'its front end an externally-coned and internally-screwed extension, the two externally-coned part-s fitting into correspondingly coned coaxial holes formed in the opposite walls of the header, substantially as set forth.

4. In a water-tube steam-generator of the class described,a laterally-perforated tubular header-stay, internally coned and externally screwed at the back end and having at its front end an internally-screwed extension, both ends being adapted to be removably fixed in coaxial holes in opposite walls of the header, substantially as set forth.

In witness whereof I have subscribed my signature in presence of two witnesses.

FREDERICK HERBERT AUS"IN VON S'IRALENDOREF.

Witnesses:

WILLIAM E. KEYS, ARTHUR MILLWARD. 

